A straw is geometrically the same as a circular piece of paper with a z depth of zero and a hole in the middle. Because the z depth is zero there is only one hole. As you add thickness the one hole remains. Therefore, a straw has one hole.
this post was submitted on 04 Jul 2023
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If you make the straw less long, it’s a donut. And a donut obviously has 1 hole. So a long donut only has one hole. Q.E.D
I didn’t expect all the other comments to also use donuts to explain this
Classic topology question. Absolutely one hole; it goes all the way through.
Of course, connotatively, two is a fine assessment, but not in topology.
How many holes does a donut have? Now just try to image the real difference between a straw and a donut. Is there one, aside from deliciousness?
Deliciousness here is only limited by bravery.
Taste. Edibility is relevant to bravery, not enjoyability.
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(3 replies)
How many holes does a donut have?
Now make the donut higher. A lot higher. Now you have a donut-tunnel. Now make the walls thinner. Now shrink it. Now you have a straw.
One hole.
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(10 replies)
It has one hole. While it appears to have two holes, if both are closed, you get a hollow sphere, which has -1 holes.
Poop. Beans. Here come the holes.
Mathematically It's one. Think of a disk, like a CD, does it have one hole or two? One, right? Now imagine you can make it thicker, I.e. increase the height, and then reduce the outer radius... Making it progressively more straw-like. At what point does it stop having 1 hole and begin to have 2?
Topologically they're the same shape.
I'm sure Matt Parker has a video on this topic in YouTube. Here
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(4 replies)
It's just one long hole.
yup, answer is 1
Hopefully none, it won't work well if there are holes.
I can't wait for Super AI to help humankind resolve these existential issues once and for all.
How many holes does a rubber band have? A donut?
Topologically a rubber band, a donut, and a straw have the same number of holes. The hole at either end of the straw is just a continuation of the same one hole.
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(2 replies)
Does a doughnut have two holes?
Because a straw is just an elongated doughnut.
1 'hole' if you can call it that. Imagine if the straw started life as a solid cylinder and you had to bore out the inside to turn it into a straw: if that were the case, you would drill 1 hole all the way through it.
Another analogy is a donut. Would you agree that a donut has just 1 hole? I would say yes. Now stretch that donut vertically untill you have a giant cylinder with a hole in the middle. That's basically now just a straw. The fact you stretched it doesn't increase the number of holes it has.
So as you begin to bore, that is one hole. But when you go through the other side, you have in fact made two holes. I think a donut can actually be thought of either as one hole or two holes, or more correctly; two holes that are the same hole.
Back to the straw; if you make another hole in the side of the straw half way up, would it still have one hole? Or two holes? Or three holes?
A bit like thinking of the human digestive tract, most of us would agree that your mouth is a different hole to your anus, but we agree that they are in two ends of the same system
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(3 replies)
Define a "hole".
It's one, big long hole. If you drilled a hole through a board, do you say it's two holes?
Or it's 0 holes, as it's not cut out of something, but rather just formed that way meaning by strict dictionary definition, there are no "holes."
Judging by what this video by Vsauce about how many holes a human has it should be one in a straw. A straw is basically just a long doughnut and there's one hole in those.
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